Matching Practice Questions

Constant folding evaluates expressions whose operands are all compile-time constants at compile time, replacing the expression with its computed value. Examples: 3 + 5 → 8, 2 * 3.14 → 6.28, true AND false → false. This eliminates the runtime computation entirely. Constant folding is often combined with constant propagation: if a variable x is known to have value 5 and y is 3, then x + y → 8 (first propagate constants, then fold). Option B describes constant propagation. Option C describes dead code elimination. Option D describes loop-invariant code motion.